How to Charge a Car Battery Without a Charger?

Whenever we drive, we have to make sure that the car battery has enough charge. But if, for some reason, we are out for a long drive and the car battery needs to be charged, then we fall into a somewhat embarrassing situation.

In the meantime, we found ourselves somehow without the charger. And that causes us a lot of trouble.

To act quietly in these tricky situations, we must know how to charge a car battery without a charger. So, today, we'll have a short pen picture regarding the topic.

If you are also a victim of those situations, read this article carefully. We hope you'll never fall into those embarrassing moments ever in your life again.

How To Charge A Car Battery Without A Charger

There are several ways you can charge a car battery without a charger. I will give you details about all the methods so you can do it yourself whenever you need.

1. Install The Battery Into Another Car

If you have access to another automobile that uses a similar battery, then you can charge your battery by utilizing that car. Before you swap over the batteries, there are a few points you require reviewing first.

  • Make sure that your down battery is the same size and shape as the alternative car battery.
  • You should also make sure that the other automobile battery includes the same MAH rating as the type of battery applied in the car.
  • Last, make sure that the contributor automobile does not require batteries to be registered with the ECU before charging.

After checking the above, you can put your battery in the supporter car. You have to make sure that the engine is turned off and any other auxiliary electrics are switched off.

If the battery is dead, then you will need to jump-start the car so that it will charge the dead battery using the alternator.

Once the battery is in, and the engine is functioning, the best way to charge your battery is to accept the vehicle for a long drive. It will ensure that the battery becomes charged thoroughly and adequately.

This is not an excellent way to charge the battery, though, but in some situations, it is very effective, especially on older vehicles that have less complicated electronics. It’s still a great idea to charge a car battery that you may run for camping.

2. Home UPS Inverter

When you are at home and need to charge a car battery, you might be wondering how to set a car battery at home without a charger? In this situation, you can use a UPS inverter.

These are usually installed with a 12V battery as a backup for a home or business. A UPS inverter can convert DC battery power to AC power.

If you get access to a UPS inverter, you can use it to charge your car battery. You have to check the inverter handbook and charge a car battery safely before you start.

Most inverters have built-in safety features to monitor the battery's voltage and prevent overcharging or overheating, but you should always check before you charge.

Although these are commonly used as a backup power supply for homes, RVs, and campsites, it does not mean that you can’t use them to charge a car battery.

3. Charge Car Battery By Laptop Charger

Are you surprised to see this point? Is it possible to charge a car battery with a laptop charger? Well! Let's see. Just follow the instructions below.

● First, connect the laptop charger adaptor to a casual bulb/lamp in series to the positive "+" terminal of the car battery. In contrast, the negative terminal "–" is linked to the laptop charger adaptor’s output to complete the series.

● The light limits the charge of current. To control this, you can associate the multimeter into a series if you wish.

● Make sure you’re not touching any of the materials of this electrical circuit. Now turn the prime power source on.

● The light bulb will burn brightly to indicate that the electrical current from the primary power source is feeding into the car battery.

4. Power Supply Unit Of A Computer

Using a computer’s power supply unit to charge a car’s battery is certainly not a pleasant feeling. If there is no other way, then this method may also be helpful.

● You will require connecting a 400-volt film capacitor to the mains power source, a resistance diode (type IN5408), and later the car battery in series. Now join the computer power supply unit to the series.

● The 12-volt power output isn’t suitable to charge a car battery. It would be best to dispose of the 12-volt system wiring (green and black wiring from the connectors).

So you can run the circuit without the electrical current passing through the alternative power stabilization with a jumper linked to the 12-volt power bus.

● You can associate a multimeter in this series to control the current flow. If it is lower than 5-volts, you require expanding the electrical pressure and current.

● Include a light bulb as a current limiter to enhance the electrical flow in the circuit. If one light bulb doesn’t adequately enhance the electricity, include more light bulbs in the series to obtain the circuit’s electrical current. If all the links are ok, you can start charging.

However, you must be careful when charging a car battery using a laptop charger, a computer’s power supply unit, or a home IPS inverter. Regular battery chargers have sensors that can cut off the power when the battery is full.

But following such methods for too long, the battery can be overloaded. Bad stuff such as the possibility of catching on fire or a tiny explosion could happen.

5. Use a Solar Panel

Another simple way to charge a car battery without a charger is by applying a solar panel or solar battery charger. This charger is relatively easy to do and is reliable to handle if you recognize a bit about things like voltage and amps.

But, it’s not the best idea to charge a car battery, especially if the battery is entirely dead.

Charging a dead battery can take around 8 hours, depending on the size of the battery and the volume of current that the solar panel can provide.

If you decide to apply a solar panel to charge your car battery, you must realize what you are doing. You can’t just connect the solar panel cables to the battery and go elsewhere.

There are a few particular approaches to hooking up a standalone solar panel to your car battery, but it is better to use a solar charge controller.

A desirable quality solar charge controller will prevent overcharging of the storm and will again block reverse current.

The second alternative you can use a solar panel is by applying a dedicated solar panel battery charger.

An excellent quality solar panel charger will have built-in all you demand to charge your car battery. 

This will care for the battery from overcharging and can also increase the life of the battery by preventing the battery from going completely flat.

When accepting a solar charger, it’s essential to get the size of the battery in your vehicle. This will determine the solar panel size needed and how long it will pick up to charge the battery.

For example, a 100W solar panel charger will make around 6 Amps. This would charge an automobile battery from the flat in around 8 to 10 hours.

Final words

How to charge a car battery without a charger is the question that almost everyone asks. Sometimes it can be too important for a person.

We have discussed many ways to solve this problem in detail. Whichever way you think is most suitable for you, you can follow. Or, if anything you want to know is relevant to the topic, please ask in our comment box.

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